Question
$32-[43-\{51-(20-\overline{18-7})\}]$
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Answer
$\begin{aligned} & 32-[43-\{51-(20-\overline{18-7})\}] \\ & =32-[43-\{51-(20-11)\}] \\ & =32-[43-\{51-9\}] \\ & =32-[43-42] \\ & =32-1 \\ & =31\end{aligned}$
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